From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A78001865FA; Tue, 2 Sep 2025 06:12:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756793528; cv=none; b=CWdxlSzPUOdcmZMOGLtVu0/haUbmAbqgPoMePmAV9ddDcxcbhoQgJp8XtpgIyclZ/kzw1cveHX7VQYZgVI6Zf38YzcEeg/mQq/qMx6v/+VpiF1CtyTrNGiXNa1lYctM/nlR9FqsgAIOSMbuq8nQtf7wW2FASJjDjY2/eicdT27s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756793528; c=relaxed/simple; bh=WHpET5CPM65c2mG2ZilHs/KpUufXou2ZaaMlzfygKF4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=H6ZopYe0ROS0EhcWaCsoeW9B+Foc1Y+M2N+mNK0HcHHzjCeBYWfYIAF5AWfOnAZ1PAhdOPGeFlHkN+vYiBfQi8/xbr7LTolxaoNDMaq6I5kooP8hj1yBTb8zWG+uRXFpFC/kph/KwMAu6CdxnZE18frl6JyAR9kjSFMyQkTKGGs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=S7RttNuH; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="S7RttNuH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1CF7BC4CEED; Tue, 2 Sep 2025 06:12:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1756793528; bh=WHpET5CPM65c2mG2ZilHs/KpUufXou2ZaaMlzfygKF4=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=S7RttNuHqhWajDoSd5i6k1zpzaSzBqmZFR8djPBMAqotaTeKVjYaVyExTOJytcNmL zismXcWn53pQ4bW219bay2CXcd1j6F1oPpmepEDsU4z/3DNiRmI6iOlEvlCZZeWZIL O/EY30K53M+biCe0GhaucVGQ6tH0Ig5Pilp4DMxWbF4lygiMdaHYipgh62yWHNTTQ/ HDPZAQ46VyjlItlhbKvbO3Pzjt1vMpim7QfvCAlinw+631DWThh5h62Bjx9NxkzVTy sRVl2mfA8wtM91jvG5swzAU6HHlGij46A09buVXgnQylnyGu/cPPhWJtRXyz6aX7At Vjlb8DBftjdWg== Message-ID: <5cbfa653-03c3-41dd-a309-406eaf3b6033@kernel.org> Date: Tue, 2 Sep 2025 08:12:03 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V4 1/4] ufs: dt-bindings: Document gear and rate limit properties To: Ram Kumar Dwivedi , alim.akhtar@samsung.com, avri.altman@wdc.com, bvanassche@acm.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, mani@kernel.org, James.Bottomley@HansenPartnership.com, martin.petersen@oracle.com Cc: linux-scsi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org References: <20250901155801.26988-1-quic_rdwivedi@quicinc.com> <20250901155801.26988-2-quic_rdwivedi@quicinc.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 01/09/2025 17:57, Ram Kumar Dwivedi wrote: > Add optional "limit-hs-gear" and "limit-rate" properties to the > UFS controller common binding. These properties allow limiting > the maximum HS gear and rate. > > This is useful in cases where the customer board may have signal > integrity, clock configuration or layout issues that prevent reliable > operation at higher gears. Such limitations are especially critical in > those platforms, where stability is prioritized over peak performance. > > Signed-off-by: Ram Kumar Dwivedi > --- > .../devicetree/bindings/ufs/ufs-common.yaml | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/Documentation/devicetree/bindings/ufs/ufs-common.yaml b/Documentation/devicetree/bindings/ufs/ufs-common.yaml > index 31fe7f30ff5b..b4c99fee552f 100644 > --- a/Documentation/devicetree/bindings/ufs/ufs-common.yaml > +++ b/Documentation/devicetree/bindings/ufs/ufs-common.yaml > @@ -89,6 +89,22 @@ properties: > > msi-parent: true > > + limit-hs-gear: > + $ref: /schemas/types.yaml#/definitions/uint32 > + minimum: 1 > + maximum: 5 No improvements. > + default: 5 > + description: > + Restricts the maximum HS gear used in both TX and RX directions. > + > + limit-rate: > + $ref: /schemas/types.yaml#/definitions/string > + enum: [Rate-A, Rate-B] lowercase > + default: Rate-B Best regards, Krzysztof